It could have gone through some major changes since I've tried it, but I found Heroic to be just a bit more plug-and-play in the sense that it handled the fancy Galaxy stuff like auto-updates, play-time stats, achievements, and cloud saves.

Literally just click install and go, like a drop-in replacement for Galaxy.

I also like that you can choose a Linux build (if it exists) or a windows-with-Proton approach depending on the game.

The only game issue I had was Undertale's Linux build that had a bit of dependency hell and wouldn't start...so flipping it to EXE-with-Proton worked like a charm.

Coolest part though? You can totally have both.

I'd personally use Lutris for things like old games that aren't from digital platforms, or for RetroArch.

I like Heroic for managing cloud saves and handling achievements with GoG titles.

Either way, both are viable and you'll get your games running somehow! Just different approaches. No harm in seeing which you like most!

Random ProTip while we're at it: If you couch game, you don't need to give that up with Linux either! Steam Link can be its own separate program from Steam itself, so it runs a lot leaner. If you have an Nvidia card you can also check out Sunlight/Moonlight for game streaming.

We truly live in exciting times. Happy gaming. :)